268 



LIMAX TENELLUS Mull. IN WALES. 



By HUGH WATSON, M.A. 



(Read before the Society, November loth, 1920). 



This species does not seem to have been hitherto recorded from 

 Wales, and it may therefore be of interest to mention that it occurs at 

 Llangam march Wells in Brecknockshire, where I found it in July, 1920. 

 It was present in more than one spot, amongst trees of various kinds, 

 on the south side of the River Irfon, between one and two miles east 

 of the village of Llangammarch. The geological formation is that of 

 the Wenlock Flags and Shales, belonging to the Silurian System, and 

 the locality is by no means a good one for snails. Slugs, however, 

 are common, and the following species were all found within a short 

 distance of the places where Lwiax tenellus occurred : — Arion ater 

 (Linne), A. sub/uscus (Drap.), A. hortensis Fer., A. circumscriptus 

 Johnston, A. intennedius Normand, Agrioliniax agrestis (Linne), and 

 Limax arboruvi B.-Ch. The last species occurred under stones on 

 the slopes of the Mynydd Eppynt, at 1,000 ft. above sea-level, as well 

 as in association with L. tenellus. In view of the fact that colour 

 alone cannot always be relied upon in the identification of slugs, it 

 may be worth pointing out that Limax tenellus is characterised not 

 only by its usual yellow colour, faintly banded mantle, and dark 

 tentacles, but also by the hinder edge of the mantle being broadly 

 rounded, the medium angle, such as we find in Z. arborum, etc., being 

 reduced to a minimum. The radula of Z. tenellus is also easily 

 distinguishable from that of any other slug known to inhabit the 

 British Isles. 



PROCEEDINGS OF THE 

 CONCHOLOGICAL SOCIETY OF GREAT BRITAIN & IRELAND. 



499th Meeting, held at the Manchester Museum, February 2nd, 1921. 

 Mr. R. Standen in the chair. 



Donation to Library. 



" Manual of Conchology," part loi, by H. A. Pilsbry {from the author). 



New Members Elected. 



Miss J. D. Robertson. Leslie S. V. Watson. 



Resignation. 



3. Kidson Taylor. 



